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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c4d1ad30b65b44bd4e851e2394eec4643d2e8d35ab19b47ce47b65f17a7ab3' 
  AND token = '7LYnloZFQBpZii81wNjzhJ0uy2Yp4llw9m8TmQmy4ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}